eprintid: 7937 rev_number: 4 userid: 6 dir: disk0/00/00/79/37 datestamp: 2011-11-10 19:45:40 lastmod: 2016-11-15 13:43:54 status_changed: 2011-11-10 19:45:40 type: thesis_degree metadata_visibility: show contact_email: chemman1@pitt.edu item_issues_count: 0 eprint_status: archive creators_name: Morris, Mark William creators_email: chemman1@pitt.edu creators_id: CHEMMAN1 title: USING THE FLOWING AFTERGLOW AS A CHEMICAL REACTION MASS SPECTROMETER ispublished: unpub divisions: sch_as_chemistry full_text_status: public keywords: flowing afterglow; volatile organic compounds; ion/molecule reactions; mass spectrometry abstract: The flowing afterglow was used to study the formation and reaction of protonated hexamethyldisiloxane, protonated trimethylsilanol, and the trimethylsilyl cation with a variety of neutrals. The neutrals were selected based on their importance in volatile organic compound (VOC) monitoring and/or their type (i.e. amines, ketones, etc.). The reagent ions contain the trimethylsilyl group, which has been referred as a "large proton". The hydronium ion is used in VOC analysis; this ion clusters with water and only provides molecular weight information. Various products were identified such as proton transfer, trimethylsilyl transfer, hydride ion transfer, etc. Secondary products were also identified, which formed because of the presence of excess neutrals. These secondary products are unimportant if the reagent ions listed above are used for trace gas analysis.The flowing afterglow was used as a chemical reaction mass spectrometer to measure Henry's law constants. The Henry's law constant for acetonitrile was measured to be 49 ± 7, while the average value in the literature is 52 ± 3 mol/kg bar; the constant for acetone was measured to be 27 ± 3 and the literature value is 28 ± 3 mol/kg bar. The chemical reaction mass spectrometer was also used to detect VOCs from thermal decomposition of phenolic resin coated on a graphitic board. A custom SS vessel was used to decompose the resin. Phenol, ammonia, methyl and dimethyl phenol, and other VOCs were detected and quantified. Concentrations ranged from 0.1 to 10 ppm for a 50.5 mg piece of graphitic board. date: 2007-09-19 date_type: completed institution: University of Pittsburgh refereed: TRUE etdcommittee_type: committee_chair etdcommittee_type: committee_member etdcommittee_type: committee_member etdcommittee_type: committee_member etdcommittee_name: Grabowski, Joseph J etdcommittee_name: Michael, Adrian etdcommittee_name: Hadad, Christopher etdcommittee_name: Weber, Stephen etdcommittee_email: joeg@pitt.edu etdcommittee_email: amichael@pitt.edu etdcommittee_email: hadad.1@osu.edu etdcommittee_email: sweber@pitt.edu etdcommittee_id: JOEG etdcommittee_id: AMICHAEL etdcommittee_id: etdcommittee_id: SWEBER etd_defense_date: 2007-05-02 etd_approval_date: 2007-09-19 etd_submission_date: 2007-05-23 etd_access_restriction: immediate etd_patent_pending: FALSE assigned_doi: doi:10.5195/pitt.etd.2011.7937 thesis_type: dissertation degree: PhD committee: Joseph J Grabowski (joeg@pitt.edu) - Committee Chair committee: Adrian Michael (amichael@pitt.edu) - Committee Member committee: Christopher Hadad (hadad.1@osu.edu) - Committee Member committee: Stephen Weber (sweber@pitt.edu) - Committee Member etdurn: etd-05232007-154140 other_id: http://etd.library.pitt.edu/ETD/available/etd-05232007-154140/ other_id: etd-05232007-154140 citation: Morris, Mark William (2007) USING THE FLOWING AFTERGLOW AS A CHEMICAL REACTION MASS SPECTROMETER. Doctoral Dissertation, University of Pittsburgh. (Unpublished) document_url: http://d-scholarship-dev.library.pitt.edu/7937/1/morris_mark_w_etd.pdf